Mighty Max Battery 14.4V NiCD Battery for iRobot Roomba 4188, 4220, 4225 Brand Product This battery is fully compatible with all Roomba FloorVac models 1 Year Warranty 14.4V 2.0AH NiCD Battery Compatible with iRobot Models: iRobot Discovery Series iRobot Dirt Dog Models Mighty Max batteries are made with the highest quality materials.